Part of
Part Of
Understanding Social Security
Explore The Guide

What Is Social Security?

Social Security is the term used for the Old-Age, Survivors, and Disability Insurance (OASDI) program in the United States, run by the Social Security Administration (SSA), which is a federal agency. Though it is best known for retirement benefits, it also provides survivor benefits and income for workers who become disabled.

Key Takeaways

  • Social Security is a federal program in the U.S. that provides retirement benefits and disability income to qualified people, as well as their spouses, children, and survivors.
  • To qualify for Social Security retirement benefits, workers must be at least 62 years old and have paid into the system for 10 years or more.
  • Workers who wait to collect Social Security, up to age 70, will receive higher monthly benefits.
  • Spouses and ex-spouses may also be eligible for benefits based on the earnings record of their partner or former partner.
  • People who can’t work due to a disability may be eligible for benefits if they meet certain requirements.

How Social Security Works

Social Security is an insurance program. Workers pay into the program, typically through payroll withholding where they work. Self-employed workers pay Social Security taxes when they file their federal tax return. 

Workers can earn up to four credits each year. In 2021, for every $1,470 earned, one credit is granted until $5,880, or four credits, has been achieved. That money goes into two Social Security trust funds—the Old-Age and Survivors Insurance Trust Fund (OASI) for retirees and the Disability Insurance Trust Fund (DI) for disability beneficiaries—where it is used to pay benefits to people currently eligible for them. The money that is not spent remains in the trust funds.

A board of trustees oversees the financial operation of the two Social Security trust funds. Four of the six members are the secretaries of the departments of Treasury, Labor, and Health and Human Services, and the Commissioner of Social Security, while the remaining two members are public representatives appointed by the president and confirmed by the Senate.

Medicare, the federal health insurance program for Americans 65 and older and some people with disabilities, is also supported through payroll withholding, but that money goes into a third trust fund, managed by the Centers for Medicare & Medicaid Services (CMS).

Social Security benefits are calculated based on a person's average indexed monthly earnings (AIME) during their 35 highest-earning years.

Types of Social Security Benefits

Social Security provides benefits to retirees, their survivors, and workers who become disabled.

Retirement benefits

Workers who have paid into the Social Security system for at least 10 years become eligible for early retirement benefits at age 62. Waiting until your “full retirement age”—65 to 67 depending on when you were born—results in higher monthly benefits. If you delay collecting retirement benefits to age 70, then you will receive even more, but benefits don't increase if you wait longer.

Spouses can also claim benefits based on either their own earnings record or their spouse’s. A divorced spouse who is not currently married can receive benefits based on an ex-spouse’s earnings record if the marriage lasted at least 10 years. Children of retirees can also receive benefits until they turn 18 (longer if the child is disabled or a student). The cutoff is 16 if you are caring for a child who is not your own.

Workers can get a projection of their benefits at different retirement ages by using the Retirement Benefits Estimator on the Social Security Administration website.

Disability benefits

People who can’t work due to a physical or mental disability that is expected to last for a year or more—or result in death—may be eligible for Social Security disability benefits. To qualify, you generally have to meet certain earnings tests. Family members of disabled workers can also be eligible.

Survivors benefits

The spouse and children of a deceased worker may be eligible for survivor benefits based on the worker’s earnings record. That includes surviving spouses who are 60 or older, or 50 or older and disabled, provided they have not remarried. A surviving spouse who is caring for a child who is younger than 16 or is disabled may be eligible for these benefits too.

For children to receive benefits, they must generally be younger than 18 or disabled. Under certain circumstances, a stepchild, grandchild, step-grandchild, or adopted child may also qualify for benefits.

Parents age 62 or older who were dependent upon a deceased worker for at least half of their income may also be able to collect benefits. In some circumstances, surviving spouses and minor children are also entitled to a one-time payment of $255 after an eligible worker’s death.

The History of Social Security

The Social Security system in the U.S. came into existence on Aug. 14, 1935, when President Franklin D. Roosevelt signed the Social Security Act into law. The first monthly benefits checks became payable on Jan. 1, 1940, and the first person to collect one was Ida M. Fuller, a retired legal secretary in Vermont. Her check was for $22.54.

The system and its rules have evolved in the decades since. Today, Social Security is one of the largest government programs in the world, paying out hundreds of billions of dollars each year.

176 million

The number of people who are paying Social Security taxes in 2021. About 65 million receive monthly Social Security benefits.

The Future of Social Security

With the aging of the U.S. population, some observers have raised concerns about the viability of a system in which fewer active workers will be supporting greater numbers of retirees.

In its 2021 report, the Social Security Board of Trustees forecasts that the retirement fund (OASI Trust Fund) reserves will become depleted in 2033 (versus 2034 per the 2020 report), due in part to the COVID-19 pandemic that led to reduced employment and earnings. At that time, the continuing tax income will be enough to pay 76% of scheduled benefits going forward. The trustees forecast that the disability trust fund—the DI Trust Fund—will dry up in 2057 (versus the 2065 estimate in the 2020 report).

If that prediction holds, Congress will need to find ways to fill the gap, which might mean higher taxes on workers, lower benefits, higher age requirements for retirees, or some combination of these elements.

It's worth noting that the 2021 report assumes that the pandemic "will have no net effect on the individual long-range ultimate assumptions." Trustees noted that they will monitor the situation and may update projections in future reports to account for material changes.

What Benefits Does Social Security Provide?

Social Security provides benefits for qualified retirees, disabled people, as well as for their spouses, children, and survivors. The benefit amount is based on your earnings history, among other factors.

What Is the Difference Between Social Security and Supplemental Security Income (SSI)?

Supplemental Security Income (SSI) is a separate program from Social Security benefits for retired or disabled people and their survivors. SSI provides monthly cash distributions to elderly or disabled people with little to no income to help them meet their basic needs.

What Is Full Retirement Age?

Full retirement age (FRA) is the age you must reach to be eligible to receive full retirement benefits from Social Security. The age varies depending on when you were born. The FRA is 66 years and two months for those born in 1955 and gradually increases to 67 for those born in 1960 and after.

Article Sources
Investopedia requires writers to use primary sources to support their work. These include white papers, government data, original reporting, and interviews with industry experts. We also reference original research from other reputable publishers where appropriate. You can learn more about the standards we follow in producing accurate, unbiased content in our editorial policy.
  1. Social Security Administration. "Quarter of Coverage." Accessed Dec. 14, 2021.

  2. Social Security Administration. "What Are the Trust Funds?" Accessed Dec. 14, 2021.

  3. Social Security Administration. "Signatories to the Trustees Reports." Accessed Dec. 14, 2021.

  4. U.S. Centers for Medicare & Medicaid Services. "How Is Medicare Funded?" Accessed Dec. 14, 2021.

  5. Social Security Administration. "Your Retirement Benefit: How It’s Figured." Accessed Dec. 14, 2021.

  6. Social Security Administration. "How You Earn Credits," Page 3. Accessed Dec. 14, 2021.

  7. Social Security Administration. "Full Retirement and Age 62 Benefit by Year of Birth." Accessed Dec. 14, 2021.

  8. Social Security Administration. "Delayed Retirement Credits." Accessed Dec. 14, 2021.

  9. Social Security Administration. "Retirement Benefits." Accessed Dec. 14, 2021.

  10. Social Security Administration. "Benefits for Children." Accessed Dec. 14, 2021.

  11. Social Security Administration. "Disability Benefits." Accessed Dec. 14, 2021.

  12. Social Security Administration. "If You Are the Survivor." Accessed Dec. 14, 2021.

  13. Social Security Administration. "Historical Background and Development of Social Security." Accessed Dec. 14, 2021.

  14. Social Security Administration. "A Summary of the 2021 Annual Reports." Accessed Dec. 14, 2021.

  15. Social Security Administration. "Social Security Board of Trustees: Combined Trust Funds Projected Depletion One Year Sooner Than Last Year." Accessed Dec. 14, 2021.

Take the Next Step to Invest
The offers that appear in this table are from partnerships from which Investopedia receives compensation. This compensation may impact how and where listings appear. Investopedia does not include all offers available in the marketplace.